Format JSON with Slack slash command and Flask

jsonformatter.py

#!/usr/bin/python
# -*-coding: utf-8 -*-

# This is a Flask app that accepts raw JSON from Slack with /json command and returns indented JSON

from flask import Flask, request, jsonify, abort
import json
import demjson
import requests


app = Flask(__name__)

config = json.loads(open('config.json').read())


def format_json(text, decoder):
    return json.dumps(decoder(text), indent=4, ensure_ascii=False)


def pre_json(text):
    return '```{0}```'.format(text)


@app.route('/', methods=['POST'])
def slash_command():
    # Parse the parameters
    token = request.form.get('token', None)
    command = request.form.get('command', None)
    raw_text = request.form.get('text', None)
    response_url = request.form.get('response_url', None)

    # Validate token
    if not token or token != config['slash_token']:
        abort(400)

    if command == '/json':
        attachments = []
        try:
            text = pre_json(format_json(raw_text, json.loads))
        except Exception:
            try:
                text = pre_json(format_json(raw_text, demjson.decode))
                error_text = 'Unrestricted Mode'
            # Use demjson to print friendly error
            except Exception as demjson_error:
                text = pre_json(raw_text)
                error_text = demjson_error.message
            attachments = [{"text": "", "footer": error_text}]

        # Post message with another request
        requests.post(response_url,
                      json={
                          "response_type": "in_channel",
                          "text": text,
                          "attachments": attachments,
                      })

        # Return empty string to original slash command to hide the original message
        return ""

if __name__ == '__main__':
    app.run()